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The National Science Olympiad is a competitive exam for high school students held each year by School connect online. The Olympiad allows them to assess their academic progress by allowing them to compete against students from all over the country. Students who compete in the Olympiad are ranked based on their performance. Based on these grades, students can assess themselves at the school, city, zonal, and international levels. Students who participate also receive a Student Performance Report (SPR) that provides a detailed performance comparison. This article contains comprehensive notes on  Science Chapter 4 For Class 3: food.

The objective of School Connect Online is to bring together the world’s most gifted primary, secondary, and higher secondary students in a friendly competition at the highest level. The Olympiads do not directly lead to career benefits; rather, they serve as a catalyst to begin a career in science or mathematics and to embark on a lifelong journey into the realms of exciting intellectual challenges. The Olympiads are more than just competitions; they are gatherings of the world’s brightest young minds, and many friendships formed at the Olympiads form the seeds of later scientific collaboration. The Olympiads, like the Olympics in sports, is a celebration of the best in school-level science and mathematics.

Science Chapter 4 For Class 3: Food Notes

Everything that lives requires food. Vegetarians are people who do not consume meat or fish. Non vegetarians are those who consume meat, fish, or both. Food is derived from either plants or animals.

We cannot survive without food because it provides energy for our bodies to function properly. Even when we are sleeping, our bodies require energy. Many organs work constantly, whether we are working or relaxing. Food aids in disease prevention and treatment.

Food provides nutrients to our bodies. Different foods contain different types of nutrients in varying amounts. Carbohydrates, proteins, vitamins, fats, and minerals are examples of nutrients. Because no single food contains all of the nutrients in the desired quantities, we must eat a balanced diet to ensure proper body functioning. A balanced diet is one that contains the proper proportions of carbohydrates, fats, proteins, vitamins, minerals, and water needed to maintain good health.



Carbohydrates are a major type of nutrient. It provides energy to the body, primarily the brain and nervous system. We require energy for all activities such as walking, dancing, writing, jumping, walking, and so on. Sugars are naturally found in foods such as fruits (apples, bananas, and grapes), vegetables (potatoes and pumpkin), milk, milk products, whole-grain bread, cereals (wheat, maize, and rice), starchy vegetables, legumes, and refined sugar are examples.


Fats, like carbohydrates, provide energy to the body. When carbohydrates are unavailable, they serve as an energy reserve. It aids the body’s absorption of fat-soluble vitamins. It aids in keeping the body warm by maintaining normal body temperature. Fat-rich foods include oil, butter, nuts, coconut, ghee, cheese, and cream.


It is necessary for body maintenance and repair. Children require more protein to grow. Protein is required for healthy hair, skin, eyes, muscles, and other organs. It is an essential component of blood (hemoglobin is a protein) and aids in the transportation of oxygen throughout the body. Meat, fish, cheese, beans, lentils, yogurt, nuts, and seeds are all high in protein.


Vitamin A aids in the formation and maintenance of healthy teeth, bones, and skin. It also aids in the formation of red blood cells and the maintenance of the nervous system. It aids in the prevention of infection and disease. Vitamin-rich foods include broccoli, papaya, almonds, sunflower oil, spinach, carrot, pumpkin, orange, and beans, among others.


The body requires a variety of minerals, including calcium, iron, sodium, potassium, and others. To stay healthy, we require all minerals in the appropriate amounts. Calcium is required by our bodies to maintain healthy bones and teeth. Calcium is obtained from milk, milk products, and so on. Iron is another mineral that aids in the formation of blood. Red meats, dried fruits, and green leafy vegetables are all high in iron.

Fiber and water

Dietary fiber, also known as roughage, is the indigestible portion of plant-based food. Fiber comes from fruits and vegetables, as well as the outer coverings of cereals and pulses. Water and fiber aid in the cleansing of the digestive tract by removing waste from the body. Water aids in the regulation of body temperature.

Milk – complete food.

Milk is considered a complete food because it contains almost all of the nutrients that the body requires.

The body’s energy requirements are determined by age, gender, body size, and composition. People who engage in physical activity, such as players and athletes, require more energy.

Junk Food

Junk food can cause digestive issues. It is deficient in essential nutrients such as vitamins, proteins, and minerals.

How can we keep our bodies healthy?

We should exercise on a regular basis to keep our bodies healthy. We should eat a well-balanced diet. We should drink 6-8 glasses of water per day.

School Connect Online offers olympiads such as:

1.National Science Olympiad (NSO)

2. International Mathematics Olympiad (IMO)

3. Coding Olympiad 

4.Artificial Intelligence Olympiad.

Prepare for your Olympiad coaching with the School Connect Olympiad by interacting with one of the greatest educators from IIT, NIT, as well as other institutions!

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